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## Main Question or Discussion Point

Hey,

This is my first post so I am hoping to do everything right :-)

I do not understand the physical meaning of a complex wavenumber. I understand that, with a general approach u(x,t) = Re(A*[e][(i(kx-omega*t)]) and a complex wavenuber that the wave is decaying exponentially with x. What happens to the energy in that case? In the literature I can only find that the rod (wave propagation in solids) is absorbing all the energy. What kind of energy is it? Thermal energy due to friction (but that is not modeled) or destrucitve interferences (But where is it reflected?)

Thanks for your response,

Jens

This is my first post so I am hoping to do everything right :-)

I do not understand the physical meaning of a complex wavenumber. I understand that, with a general approach u(x,t) = Re(A*[e][(i(kx-omega*t)]) and a complex wavenuber that the wave is decaying exponentially with x. What happens to the energy in that case? In the literature I can only find that the rod (wave propagation in solids) is absorbing all the energy. What kind of energy is it? Thermal energy due to friction (but that is not modeled) or destrucitve interferences (But where is it reflected?)

Thanks for your response,

Jens